Account of the Tele/cope at Kiel. 1 15 



place of the frame only is marked. In this frame the tube is 

 made to move on a ftrong roller. At the upper end of the 

 frame is fufpended one box of a tackle of fix pulleys, the 

 fccond box of which is faftened to the crofs beam / / of the 

 hanging frame-work, and the rope Ip, proceeding from the 

 tackle, is wound round the cylinder of a horizontal windlafs, 

 the handle of which is in part vifible at 1 1. The fecond 

 refting-place of the tube is in a fork on the top of an iron 

 rack q, by which the more accurate movement both vertical 

 and horizontal is effected with the greateft eafe. When 

 the handle 1 1 is turned round, the Aiding frame together 

 with the tube rifes or falls, and a common fpring catch ap- 

 plied to the windlafs keeps the tube in that pofition to which 

 it has been brought. To counteract the weight of the 

 tube, which increafes according to the perpendicularity of 

 its pofition, the ProfefTor faftened to the end of it a fmall 

 tackle, the rope of which, carried over a pulley fixed to 

 the crofs beam //, fuftains a re-a&ing weight of 120 pounds. 

 This weight a£ts only from the perpendicular fituation of 

 the tube to about that in which it is reprefented in the plate. 

 The quick horizontal movement, which is effected by means 

 of the crofs-bar lever with the cylinder and horizontal wheel, 

 requires a power of about forty pounds ; fo that the obferver 

 can, with great eafe, turn the tube round the whole hori- 

 zon, though the weight of the conftru£tion taken together 

 amounts to about 12,000 pounds. 



From comparing this defcription with the figure in the 

 annexed plate, it will be fecn that the gravity, both on ac- 

 count of the weight of the hanging frame-work and that 

 of the tube, muft incline too much to one fide : it was 

 found neceflary, therefore, immediately after it w r as con- 

 ftructcd, to devife the following counterpoife : The two 

 horizontal beams GG, a foot fquare, which fupport the gal- 

 lery FF, with the ladder that conduits to the platform, 

 were made to project on a level with the bottom part of the 

 cabin. The weight of the gallery and ladder caufed a 

 I z leflening 



